I am, so share your thoughts anyway. I'm also interested for a future character of mine.
Anyway, I was thinking of making Skyrim get itself bugged on a certain place, and take that as a hideout. But maybe i'd better check the mods. I believe the storage places still do respawn, even if the enemies don't. I'll get a normal house for my cover business too. Can't have dangerous evidence of my illegal activities out in the open, now can we? Especially since I plan on marrying the guy.
There are a couple of good mods on the Skyrim Nexus. You have to make an account and download the mod manager, but I did see a couple of evil lairs down there, I forget what they are, you should check it out
Oh wait, you don't want any stuff lying around... hm... you may find a mod like that. I remember build your own house mod had a secret passage that was either werewolf or vamp themed